/**
 * 修改记录:
 * 25-01-09     郑朝军     从FileController中抽取WebSocket上传相关代码
 */

/**
 * uni.cxapp.WsUploader
 * WebSocket文件上传器，处理基于WebSocket的文件分块上传
 *
 * @class
 * @memberof    uni.cxapp.WsUploader
 */
class WsUploader 
{
  /**
   * 构造函数
   * @param {Object} options 配置选项
   */
  constructor(options = {}) 
  {
    this.wsUploadUrl = options.wsUploadUrl
    this.chunkSize = options.chunkSize || 1024 * 1024 // 1MB
    this.uploadProgress = options.uploadProgress
    this.onUploadComplete = options.onUploadComplete
    this.onUploadError = options.onUploadError
    this.notifyChange = options.notifyChange
  }

  /**
   * 通过WebSocket上传文件
   * @param {number} entityId 实体ID
   * @param {Object} fileBean 文件对象
   * @param {Function} onSuccess 成功回调
   * @param {Object} fileController 文件控制器实例
   * @returns {Promise<void>}
   */
  async uploadFileViaWebSocket(entityId, fileBean, onSuccess, fileController) 
  {
    return new Promise((resolve, reject) => 
    {
      try 
      {
        const ws = new WebSocket(this.wsUploadUrl)
        let currentChunk = 0
        let uploadedBytes = 0

        ws.onopen = () => 
        {
          console.log('WebSocket连接已建立')
          this.sendFileChunk(ws, fileBean, currentChunk, entityId, fileController)
        }

        ws.onmessage = (event) => 
        {
          const response = JSON.parse(event.data)

          if (response.type === 'chunk_received') 
          {
            currentChunk++
            uploadedBytes += response.chunkSize

            // 更新进度
            const progress = uploadedBytes / response.totalSize
            fileBean.progress = progress

            if (this.uploadProgress) 
            {
              this.uploadProgress(fileBean, progress)
            }

            if (this.notifyChange) 
            {
              this.notifyChange()
            }

            if (currentChunk < response.totalChunks) 
            {
              this.sendFileChunk(ws, fileBean, currentChunk, entityId, fileController)
            }
          }
          else if (response.type === 'upload_complete') 
          {
            ws.close()
            fileController.uploadBack(response.data, entityId, fileBean, onSuccess)
              .then(resolve)
              .catch(reject)

            if (this.onUploadComplete) 
            {
              this.onUploadComplete(fileBean, response.data)
            }
          }
          else if (response.type === 'error') 
          {
            ws.close()
            reject(new Error(response.message))
          }
        }

        ws.onerror = (error) => 
        {
          console.error('WebSocket错误:', error)
          reject(error)
        }

        ws.onclose = () => 
        {
          console.log('WebSocket连接已关闭')
        }
      }
      catch (error) 
      {
        reject(error)
      }
    })
  }

  /**
   * 发送文件分块
   * @param {WebSocket} ws WebSocket连接
   * @param {Object} fileBean 文件对象
   * @param {number} chunkIndex 分块索引
   * @param {number} entityId 实体ID
   * @param {Object} fileController 文件控制器实例
   */
  sendFileChunk(ws, fileBean, chunkIndex, entityId, fileController) 
  {
    // 这里需要根据实际平台实现文件分块读取
    const chunkData = {
      type: 'file_chunk',
      filename: fileBean.title,
      chunkIndex: chunkIndex,
      chunkSize: this.chunkSize,
      data: '', // 实际的文件数据
      major: fileController.major,
      minor: fileController.minor,
      entityId: entityId,
      busType: fileBean.busType,
      task: fileBean.task,
      memo: fileBean.memo
    }

    ws.send(JSON.stringify(chunkData))
  }

  /**
   * 销毁上传器
   */
  destroy() 
  {
    this.uploadProgress = null
    this.onUploadComplete = null
    this.onUploadError = null
    this.notifyChange = null
  }
}

export default WsUploader